Is uploading desirable?

Just a few issues I'd like to bring up.
1. Uploading: If feasible, is it desirable? Why would someone want to
upload?
2. Is is reasonable to expect to be able to upload an analogue system to
a digital
system without quantization error and aliasing?
3. If it is possible to create a neural analogue, how can we expect
identity to
remain intact when twins who are structurally identical do not have
identical
personalities and identities?
4. How can we prevent the introduction of chaos due to rounding errors?
5. Taking all of the above into consideration, would proponents of
uploading
accept a machine personality that diverges from the biological personality
due to
the individual environment differences?
JMH
jmax at panix.com